| Description | Date | Identifier | |
| Follow-up letter regarding the design and weight reduction of a Bentley piston set. | 7th Jun 1941 | Box 148 \ 1 scan0330 | |
| Delay in the supply of piston pressings from H.D.A. | 20th Jun 1941 | Box 148 \ 1 scan0331 | |
| Letter to The Light Production Co. returning six 2.5' bore pistons for final grinding as their own works are unable to complete the operation. | 1st Jul 1941 | Box 148 \ 1 scan0332 | |
| Letter concerning the proposal to grind six 2.5 inch diameter pistons to a specific drawing. | 4th Jul 1941 | Box 148 \ 1 scan0333 | |
| Gudgeon pin weights, detailing savings from boring out pins and proposals for further lightening. | 11th Jul 1941 | Box 148 \ 1 scan0334 | |
| Letter from The Light Production Co. Ltd. to Mr. C.T. Salt awaiting a call. | 24th Oct 1941 | Box 148 \ 1 scan0335 | |
| Letter to Light Production Co., Ltd. regarding the production of pistons and rings for a bore engine. | 8th Dec 1941 | Box 148 \ 1 scan0336 | |
| Letter to The Light Production Co. Ltd. regarding the finishing of RE.1824 pistons and requesting material specifications. | 22th Dec 1941 | Box 148 \ 1 scan0337 | |
| Proposal to change the treatment of sand castings from linseed oil to cellulose paint for all chassis. | 6th Oct 1938 | Box 148 \ 2 scan0001 | |
| Comparison of existing Linseed Oil and proposed Cellulose Paint treatments, detailing the operational steps, timings, and costs. | 6th Oct 1938 | Box 148 \ 2 scan0002 | |
| Cost comparison between cellulose and linseed oil spraying for engines, calculating the total annual savings. | 6th Oct 1938 | Box 148 \ 2 scan0003 | |
| Cost-saving on the Bentley spare wheel retaining disc. | 6th Oct 1938 | Box 148 \ 2 scan0004 | |
| Costs of a B.50 Semi-Floating Rear Axle. | 10th Oct 1938 | Box 148 \ 2 scan0005 | |
| Investigation into changing the manufacturing process for a water pipe drain bracket from casting to stamping. | 11th Oct 1938 | Box 148 \ 2 scan0006 | |
| Outlining the system for correspondence and filing related to Experimental Coachwork. | 11th Oct 1938 | Box 148 \ 2 scan0007 | |
| Filing and storage locations for coachwork and experimental documents. | 11th Oct 1938 | Box 148 \ 2 scan0008 | |
| Feasibility and costs of adapting a Wraith engine for use as a marine power unit. | 12th Oct 1938 | Box 148 \ 2 scan0009 | |
| Competitor Lagonda's claims about sustained maximum speeds. | 17th Oct 1938 | Box 148 \ 2 scan0010 | |
| Letter from Lagonda Motors Limited to Jack Barclay Ltd. detailing recent successes at Brooklands and new models at the Motor Show. | 13th Oct 1938 | Box 148 \ 2 scan0011 | |
| Merits of painting engine crankcases with cellulose versus linseed oil, referencing practices at Leyland and the Aero division. | 18th Oct 1938 | Box 148 \ 2 scan0012 | |
| Progress and plans for building various experimental cars and engines. | 18th Oct 1938 | Box 148 \ 2 scan0013 | |
| Instructions on camshaft materials, machining processes for cast iron engines, and plans for future testing. | 18th Oct 1938 | Box 148 \ 2 scan0014 | |
| Competitor's (Lagonda) sustained speed tests and expressing doubts about their car's capabilities on German autobahns. | 19th Oct 1938 | Box 148 \ 2 scan0015 | |
| The cost implications of a design change to the Wraith cylinder head to overcome cracking. | 21th Oct 1938 | Box 148 \ 2 scan0016 | |
| Comparing supplier quotations for different frame designs, detailing prices and tool costs. | 21th Oct 1938 | Box 148 \ 2 scan0017 | |
| Internal memorandum discussing supplier quotations and pricing proposals for vehicle frames. | 19th Oct 1938 | Box 148 \ 2 scan0018 | |
| Frame painting, costs, and assembly with the supplier Thompsons. | 19th Oct 1938 | Box 148 \ 2 scan0019 | |
| Preliminary analysis of the cost and weight for new high-power engine units. | 26th Oct 1938 | Box 148 \ 2 scan0020 | |
| Engine power development, valve timing, and plans for a Straight Eight and a 5-litre Six-cylinder engine. | 26th Oct 1938 | Box 148 \ 2 scan0021 | |
| The merits and costs of an aluminium straight eight engine compared to a cast iron version. | 26th Oct 1938 | Box 148 \ 2 scan0022 | |
| Experimental expenditure and testing of a double leading shoe brake designed by Capt. Irving. | 29th Oct 1938 | Box 148 \ 2 scan0023 | |
| Comparative table of gearbox material costs for the B.50 and Wraith models. | 1st Oct 1938 | Box 148 \ 2 scan0024 | |
| Disposition of various chassis units, including which are to be scrapped, stored, or kept for future use. | 2nd Nov 1938 | Box 148 \ 2 scan0025 | |
| Cost and reasons for experimental scrap due to design changes and incorrect drawings. | 3rd Nov 1938 | Box 148 \ 2 scan0026 | |
| Letter to Park Ward & Co. Ltd. detailing the procedure for ordering and costing experimental bodies. | 4th Nov 1938 | Box 148 \ 2 scan0027 | |
| Design and installation of six and eight-cylinder cast iron engines in a prototype chassis. | 9th Nov 1938 | Box 148 \ 2 scan0028 | |
| Urging progress on vacuum-assisted brake experiments and simplifying the servo design. | 9th Nov 1938 | Box 148 \ 2 scan0029 | |
| Experiments with wheel disc designs, focusing on cost, fitting, and resolving issues like forward creep. | 9th Nov 1938 | Box 148 \ 2 scan0030 | |
| Design, cost, and standardisation of wheel discs for the B.III wire wheel. | 9th Nov 1938 | Box 148 \ 2 scan0031 | |
| Clarifying the correct type name for the independently sprung Bentley chassis to avoid confusion. | 10th Nov 1936 | Box 148 \ 2 scan0032 | |
| Progress report on the Rationalised Car Programme, detailing prototype testing and model specifications. | 11th Nov 1938 | Box 148 \ 2 scan0033 | |
| Material cost savings and the production status of various prototype chassis. | 8th Nov 1938 | Box 148 \ 2 scan0034 | |
| The potential range of rationalised models, detailing chassis, engine, and body options. | 8th Nov 1938 | Box 148 \ 2 scan0035 | |
| Secret internal memorandum discussing car pricing strategy, profitability, and the future model programme after the B.III launch. | 12th Nov 1938 | Box 148 \ 2 scan0036 | |
| Proposals for new car models, pricing, and market positioning. | 12th Nov 1938 | Box 148 \ 2 scan0037 | |
| To avoid confusion by proposing a new name for the Bentley B.III model. | 14th Nov 1938 | Box 148 \ 2 scan0038 | |
| Proposing design modifications to reduce the factory cost of the Wraith Chassis. | 15th Nov 1938 | Box 148 \ 2 scan0039 | |
| Proposing component changes to the Wraith chassis for cost-saving purposes. | 15th Nov 1938 | Box 148 \ 2 scan0040 | |
| Cost-saving proposals for the Wraith model concerning the Monikrome Camshaft, Coined Connecting Rods, and Steering Box Mounting. | 16th Jun 1938 | Box 148 \ 2 scan0041 | |
| Chassis development programme, including engine sizes, wheelbase, and radiator options for future models. | 18th Nov 1938 | Box 148 \ 2 scan0042 | |
| Future car model strategy, focusing on engine size, body space, and model positioning. | 16th Nov 1938 | Box 148 \ 2 scan0043 | |
| Secret memorandum discussing the experimental production stage of the Bentley V Chassis, referencing learnings from the Wraith. | 19th Nov 1938 | Box 148 \ 2 scan0044 | |
| Introduction of a new simplified gearbox for the Bentley III, weighing production costs against reliability concerns. | 10th Sep 1938 | Box 148 \ 2 scan0045 | |
| Urgent memo requesting a list of tests to be performed on a new chassis before it enters production. | 19th Nov 1938 | Box 148 \ 2 scan0046 | |
| The road and dyno test procedures for a new gearbox and rear axle. | 19th Nov 1938 | Box 148 \ 2 scan0047 | |
| The specification for the propeller shaft. | 19th Nov 1938 | Box 148 \ 2 scan0048 | |
| Requesting and detailing proposed tests for a new chassis before production. | 19th Nov 1938 | Box 148 \ 2 scan0049 | |
| Form requesting a list of tests for a new chassis before it goes into production. | 19th Nov 1938 | Box 148 \ 2 scan0050 | |
| Note about extended running in snowy conditions and the fitting of ski racks. | 10th Jan 1937 | Box 148 \ 2 scan0051 | |
| Request to outline pre-production chassis tests, with a handwritten response for electrical units. | 19th Nov 1938 | Box 148 \ 2 scan0052 | |
| Outlining the road test schedule and conditions for a new chassis before production. | 19th Nov 1938 | Box 148 \ 2 scan0053 | |
| Urgent request for a list of pre-production tests for a new chassis. | 19th Nov 1938 | Box 148 \ 2 scan0054 | |
| Memo outlining suggestions for a comprehensive 15,000-mile vehicle testing program. | 19th Nov 1928 | Box 148 \ 2 scan0055 | |
| Urgent memo requesting and receiving a handwritten list of engine unit tests before a new chassis goes into production. | 19th Nov 1928 | Box 148 \ 2 scan0056 | |
| Requesting and detailing rig testing procedures for a new chassis, specifically for suspension and brakes. | 19th Nov 1938 | Box 148 \ 2 scan0057 | |
| Outlining mileage requirements for road tests, detailing durability expectations for the car, brakes, servo, and suspension. | 19th Nov 1928 | Box 148 \ 2 scan0058 | |
| Alternative rig testing methods for springs, comparing a scraggy machine to a bump test. | 19th Nov 1928 | Box 148 \ 2 scan0059 | |
| On a delay and high cost for a specific chassis. | 19th Nov 1938 | Box 148 \ 2 scan0060 | |
| Outlining the required testing program for a new chassis before going into production. | 19th Nov 1938 | Box 148 \ 2 scan0061 | |
| Chassis testing procedure outlining dynamometer tests before production. | 19th Nov 1938 | Box 148 \ 2 scan0062 | |
| Document outlining a four-part road testing schedule. | 19th Nov 1938 | Box 148 \ 2 scan0063 | |
| Urgent internal memo requesting details on pre-production chassis testing. | 19th Nov 1938 | Box 148 \ 2 scan0064 | |
| Testing requirements for car radiators. | 19th Nov 1938 | Box 148 \ 2 scan0065 | |
| Endurance and performance requirements for fans, belts, and water pumps. | 19th Nov 1938 | Box 148 \ 2 scan0066 | |
| Durability testing specifications for ward connections, bonnets, and thermometers. | 19th Nov 1938 | Box 148 \ 2 scan0067 | |
| Test requirements for vehicle heaters, demisters, and the cooling system. | 19th Nov 1938 | Box 148 \ 2 scan0068 | |
| Cooling system performance requirements, such as mileage without water addition and corrosion resistance. | 19th Nov 1938 | Box 148 \ 2 scan0069 | |
| Summary discussing time and mileage as factors for determining the fitness of a cooling system. | 19th Nov 1938 | Box 148 \ 2 scan0070 | |
| Request for a list of tests for a new chassis, with a handwritten response outlining three specific tests. | 19th Nov 1938 | Box 148 \ 2 scan0071 | |
| Suggestions for future tests on new chassis components before going into production. | 22th Nov 1938 | Box 148 \ 2 scan0072 | |
| Testing specifications for the propeller shaft and suspension systems, detailing rig tests and road tests. | 22th Nov 1938 | Box 148 \ 2 scan0073 | |
| Testing specifications and durability requirements for vehicle components including brakes, electrical units, and the fuel system. | 22th Nov 1938 | Box 148 \ 2 scan0074 | |
| Schedule of endurance and performance tests for steering and engine components. | 22th Nov 1938 | Box 148 \ 2 scan0075 | |
| Standard endurance and performance requirements for various automotive components. | 22th Nov 1938 | Box 148 \ 2 scan0076 | |
| Test procedures for the cooling system, including dynamometer, endurance, and road tests. | 22th Nov 1938 | Box 148 \ 2 scan0077 | |
| Summary of suggested future tests including coachwork, winter running, and mileage accumulation. | 23th Nov 1938 | Box 148 \ 2 scan0078 | |
| Outlining the future chassis programme, detailing plans for Bentley and Wraith models. | 23th Nov 1938 | Box 148 \ 2 scan0079 | |
| Meeting to decide on parts release for 50 B.V. motor-cars and production strategy. | 24th Nov 1938 | Box 148 \ 2 scan0080 | |
| Counter-propaganda strategies for Bentleys in relation to Lagondas. | 24th Nov 1938 | Box 148 \ 2 scan0081 | |
| Secret memorandum detailing the chassis programme, including progress on the Wraith and Phantom III replacement models. | 25th Nov 1938 | Box 148 \ 2 scan0082 | |
| Design implications of weight and engine size for the Wraith replacement model. | 25th Nov 1938 | Box 148 \ 2 scan0083 | |
| The cost of non-adjustable Luvax Piston Type dampers and their Gordon Armstrong equivalent for comparison. | 30th Nov 1938 | Box 148 \ 2 scan0084 | |
| The cost and reasons for experimental scrap due to design changes and incorrect drawings. | 1st Dec 1938 | Box 148 \ 2 scan0085 | |
| Concerns over a story in 'Motor Sport' magazine about W.O. Bentley's design contributions and his subsequent move to Lagonda. | 5th Dec 1938 | Box 148 \ 2 scan0086 | |
| Suggestions to reduce costs for the Wraith model, covering the dynamo drive, steering box, connecting rod, and gearbox. | 6th Dec 1938 | Box 148 \ 2 scan0087 | |
| Staffing responsibility for Mr. Leslie and the methods of production. | 16th Dec 1938 | Box 148 \ 2 scan0088 | |
| Costs and reasons for experimental scrap due to chassis design changes. | 16th Dec 1938 | Box 148 \ 2 scan0089 | |
| Major failures on the Wraith model after production and the inadequacy of endurance testing procedures. | 17th Dec 1938 | Box 148 \ 2 scan0090 | |
| Outlining the minimum 50,000-mile testing requirements for new vehicle components and chassis designs. | 17th Dec 1938 | Box 148 \ 2 scan0091 | |
| Outlining the endurance testing programme for the Bentley V model, requiring 50,000 miles before general release. | 17th Dec 1938 | Box 148 \ 2 scan0092 | |
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